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(with regard to the well-known history…)

How many grains of rice can go in a Chessboard, if we place one grain in the first square, two in the second, four in the third and so on ?
The exact  formula is 2
64-1, wich we can round up to 264.

We can then make the following calculations:

• Rice grains on the chessboard = 264 = 1,84467*1019
rounded up (to) 1,85*10
19

• If we agree that 1 grain = 0,1 g = 10-4 kg. = 10-7 Tons,
the total Weight  would be
W = 1,85*10
19*10-7 = 1,85*1012 T. = 1,85 millions of millions of tons.

• If we fix its value to a dollar by kg., its total value would be
= 1,85 millions of billions of dollar!                              (
for 1 billion = 109 units )

• If we agree that 1 kg of rice = 1 liter = 1 dm3,
the total volume would be 1,85*10
12 m3 =1,85 millions of millions of m3

•  If this volume were distributed on a square of  m. 1.85 height,
their dimensions would be of 1000
*1000 km.

•  If the rice layer had a height of mm 18,5,
their dimensions would be of  10.000
*10.000 km = 100 million of km2.

•  If the rice layer had a height of mm 3.7, the same one would be sufficient to cover the whole terrestrial surface, sea including.

•  If we had to use that rice to feed to us, each inhabitant of our planet would have 264 tons, and all the humanity could feed itself during thousand years.

•  Calculating in 5 mm the length of each grain, the grains of a board, placed one behind the other, would have a length of 9,25*1019 mm =  92,500 millions of millions km, that is near 10  light-years, a length more than sufficient to cover the distance Earth - a Centauri and return !

• And finally, if we decided to count one by one the grains of rice with a speed of one grain per second, the necessary time would be of more than 53 billions of years, 4 times the age of the universe !
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